A farmer stops cultivating a large tract of farmland and abandons it. The natural changes taking place soon afterwards, such as the growth of wild grasses and weeds, can be considered: A) Secondary succession because wild grasses and weeds make soil from rocks.
B) Secondary succession because there is already soil present.
C) Primary succession because a new ecosystem develops.
D) Primary succession because the land is not controlled by humans.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.

Which of these definitions have been paired with the correct type of cell?

Which process involves glucose reacting with oxygen to produce energy, carbon dioxide, and water? a. photosynthesis b. atp production c. glycolysis d. cellular respiration